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  1. Need help from someone that understands airflow

    This is for a cut in on an older house. I'm adding a register to a room that measures 23 feet. The register will be a sidewall grill pushing out 325 cfm. I want to make sure there is enough velocity...
  2. The soffit would be sealed off. I've seen open...

    The soffit would be sealed off. I've seen open drop ceiling returns. Basically, the ceiling has drywall and then there is a drop ceiling. The air handler just pulls directly from the drop ceiling...
  3. Would a soffit return be considered a building cavity?

    I know it is against code to run returns through building cavities.

    I have to build a soffit to run supply ducts through. Can I do an open soffit return? The bedrooms would have sleeves through...
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    Supply grill selection based on FPM

    I read that a target range for FPM should be around 600 to 800. Hart and Cooley recommends 700 FPM. The companies I used to work for just based it on the approximate cfm. For example, 110 cfm would...
  5. Grace period 2015 energy efficiency standards

    During the grace period, you are allowed to sell 13 seer split systems that were manufactured prior to 1/1/2015. The grace period is set to end in June. Do you know if the manufacturer date only...
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    Finding seer rating of matched system

    What is the best way to find the seer rating and specs for a matched system? I've tried AHRI directory lookup. It seems to be hit and miss. For example, if I find an air handler that will fit my...
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    I thought about using a transfer duct, but there...

    I thought about using a transfer duct, but there is no attic. I was hoping that a roof joist would fall in the middle of the door wall, but that isn't the case. That is kind of what I was trying to...
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    Return ideas for cut in

    I don't have much experience in design. I'm adding an heatpump to an older home. It does not have attic space. I'm placing the air handler in the attic and running the ducts through a soffit. The...
  9. What features are lost by removing communicating aspect XL19i?

    This is for a heatpump. The switch is due to comfortlink incompatibility with a home automation system. If the system is setup using the 24v controls, what features would be lost? The only thing I...
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    How does a distributor handle this?

    I purchased a unit from Gemaire. Unfortunately, they are closed for the weekend.

    When I was unboxing the air handler. The suction plug fell out. I couldn't tell if I knocked it loose while...
  11. Thanks for the help. The Trane rep initially...

    Thanks for the help. The Trane rep initially contacted me and then I never heard from him again. I'm in the process of trying to get a Carrier CE account. I may just opt for Rheem while I start out. ...
  12. Purchasing Trane equipment without being a dealer

    I'm just starting my business. Trane states that there is a vetting process of a few months before they will accept you as a dealer. Is there a way to purchase Trane equipment without being a dealer?...
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    What is the missing numbers on this model?

    *dh2b080a9v3

    Is this a TUH 80k btu furnace? There is just a asterisks in front of the model. Paired with 4nxcb036ac3 coil
  14. Thread: NFPA Books

    by dave r
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    507

    NFPA Books

    I'm looking for:

    NFPA 90a Installation of Air Conditioning and Venitlating Systems 2002
    NFPA 90b Installation of Warm Air Heating and Air Conditioning Systems 2006
    NFPA 91 Standard for Exhaust...
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    Thanks for the reply. I have made a lot of final...

    Thanks for the reply. I have made a lot of final connections at furnaces, but the whole underground thing is making me question the method I should use. I don't like flare fittings on refrigeration,...
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    I want to run a 1/2in gas line from my gas meter...

    I want to run a 1/2in gas line from my gas meter to a small appliance. The distance is only about 5 or 6 feet where it would penetrate a brick wall. I would like to run it underground and was...
  17. Thread: super boost cap

    by dave r
    Replies
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    12,881

    I was just refering to start assists that are all...

    I was just refering to start assists that are all in one type devices (simply plug onto run cap). I live in Florida and have never heard of or had any trouble with the superboost not working in hot...
  18. Thread: super boost cap

    by dave r
    Replies
    16
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    12,881

    Some people don't like the start assist type...

    Some people don't like the start assist type devices (superboost, kickstart, etc). I have had problems with kickstart, but I've had good success with the superboost SPP6. It is a solid state type...
  19. Thread: Quick question

    by dave r
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    912

    Quick Question Lennox Dealers

    I used to work for a Lennox dealer and we used to never match a different brand condenser to a Lennox A/H. This was only true for heat pumps. I know it is better to do a complete change out, but some...
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    I'm have trouble finding a part for a...

    I'm have trouble finding a part for a refrigerator. The part number is WR12667 or WR120667. Do you know of a place on the web I can go to find hard to get parts? Or, maybe a place that sells used...
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    I have been an HVAC technician for about 5 years...

    I have been an HVAC technician for about 5 years now, so I'm not a conventional student. I do get ideas about how it could have been done better or how something could have been designed better to...
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    Are there any mechanical engineers that visit...

    Are there any mechanical engineers that visit this site? I just started my third year/junior year at a university and was thinking about changing my major to mechanical engineering. I haven't done...
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    When the power goes off in commercial buildings...

    When the power goes off in commercial buildings and the power is switched to a generator, does the power only feed low power consumption devices? Will it still power A/C condensers if the transfer...
  24. Thread: Flue pipe size

    by dave r
    Replies
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    8,396

    No need to get pissy. I don't do work for myself....

    No need to get pissy. I don't do work for myself. I can ask my boss why we don't. There aren't a whole lot of 90 % in central Florida, and there definitely aren't a whole lot of people that would...
  25. Thread: Flue pipe size

    by dave r
    Replies
    9
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    8,396

    I have noticed on some changeouts that the flue...

    I have noticed on some changeouts that the flue pipe is smaller than would be put in if it were new construction. For example, a 100,000btu furnace with a 40,000 water heater tied into a 5" flue. Is...
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    I know some of you here like being in the HVAC...

    I know some of you here like being in the HVAC business, but if you had the chance to do something else, would you do it? I know there are doctors out there that would change their career if they...
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    In my area, we are only suppose to do electrical...

    In my area, we are only suppose to do electrical work from the after the disconnect. However, it is very common for installer/technicians to replace the box. I think this unit is extremely dangerous...
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    We do primarily residential work, but we do deal...

    We do primarily residential work, but we do deal with some commercial. I was installing a 3 phase condenser and notified my boss that there was no ground coming into the disconnect box. He told me...
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    I had this same problem in Florida with an A/H in...

    I had this same problem in Florida with an A/H in the garage. Do you have a variable speed A/H? See if the dip switches are set correct and make sure the installers didn't hook the yellow wires to...
  30. Thread: Refrigerator

    by dave r
    Replies
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    1,019

    I am a service tech that just does HVAC. My...

    I am a service tech that just does HVAC. My friend called me up today and said his refrigerator at his house wasn't working. I haven't worked on a refrigerator since HVAC school. Well, I found that...
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